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Asset Impairment Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 74 |  | $ 2 |  | $ 166 | $ 260
US Generation Facility [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 73 | $ 83 | 0 |  | 156 | 0
Kazakhstan Hydro [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 0 |  | 2 |  | 0 | 92
Kazakhstan [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 0 |  | 0 |  | 0 | 94
DPL Subsidiary [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  | 0 |  | 0 | 66
Other Subsidiaries [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 1 |  | 0 |  | 10 | 8
Long Lived Assets Held For Sale [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 190 |  |  | 190
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses) |  |  |  |  |  | 100
Fair Value Less Costs To Sell |  |  | $ 92 |  |  | $ 92
Long Lived Assets Held For Sale [Member] | Kazakhstan [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  | $ 171 |  |
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses) |  |  |  | 92 |  |
Fair Value Less Costs To Sell |  |  |  | 29 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 94 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | US Generation Facility [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value | $ 55 | $ 127 |  |  | $ 55 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Stuart Station [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value |  |  |  | 3 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Killen Station [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value |  |  |  | $ 8 |  |

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